亚像素渲染
斑点图案
数字图像相关
变形(气象学)
流离失所(心理学)
计算
方向(向量空间)
电子散斑干涉技术
图像处理
旋转(数学)
翻译(生物学)
计算机科学
图像分辨率
数字图像处理
光学
像素
计算机视觉
散斑成像
算法
图像(数学)
数学
物理
几何学
心理学
心理治疗师
生物化学
化学
气象学
信使核糖核酸
基因
摘要
Experimental solid mechanics relies heavily on surface dis- placement and deformation gradient measurements. Digital image/ speckle correlation (DISC) uses digital image processing to resolve dis- placement and deformation gradient fields. The practical implementation of DISC involves important challenges such as computation complexity and the discrepancy of the sensitivities and accuracies claimed in previ- ous studies. We develop an iterative, spatial-gradient based algorithm, which uses only first-order spatial derivatives of the images before and after deformation. Simulated images are then used to verify this algo- rithm, as well as to study the impact of speckle size on the accuracy. Based on these simulations, the sensitivity of DISC to displacement and deformation gradient, as well as an optimal speckle size for optimal ac- curacy, is recommended. The algorithm is then calibrated using rigid body translation and rotation, and an application of DISC to thermome- chanical diagnostics of electronic packaging is also presented. © 2001
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